Sewing-machine.



J.'BERGER.

' SEWING MACHINE. APPLICATION FILED SEPT. 13, 1911.

Patented Apr. 29, 1913.

2 SHEETS-SHEET 1.

- WITNESSES:

J BERGER. snwim momma. mrnwulon FILED SEPT.13, 1911.

Patented Apr. 29,- 1913.

2 snm rksnnwaf- WITNESSES."

" JOS PH BEBGE AYoaI1E, NEw JEnsEYflissIGNoRao THE: smenn mnnureo roams comment, A coupons-non OF NEW JERSEY; f

sewmelmes To all whomiz't mlziijo onoem-i' I -Be it known that I, J osEPH BERGER, a cit-i z en"0f.-'the "United States, residing at Ba.- yonne', int-hecounty ofI-Iudson and State'of New Jersey,'have invented certain-new and useful Improvements "in.'Sewing Machines,

reference hadf therein to thela'c'com- -pan "in draw ngs? a simplefand effective mechanism for laying 1s invention has for its obj e ct to provide 'j -a covering-thread;transversely in' advance of. aplurality of reciprocating needles confis- the work-plate.

E S'titutihg meihblsof a multiple stitch -form-, F gm'echani' m; a I 5 h l 'present ated by meansof a rock-shaftjournaled in thread-carrying loopet" operating.- beneath anism 'comprises an apertured and a forked covering-thread member adapted for. recip- ,rocal movement't-ransversely ofithe direction of feed and in advance of the needlesand having an operative connection with the needle-actuating rock-shaftincluding a toggle device. adapted to be straightened when the needles are withdrawn from the work.

In the accompanying drawings, Figure .1 is a sectional front elevation of. a' nachine embodying the present improvement,- and- Fig. 2 a front'endelevation of the same with the'it'ac'e-plate of the bracket-arm -removed.

. Fig. 3 is. a perspectiveview' sh vgnlgthe stitch-forming and covering-th'rea laying mechanisms. Fig. .tlS a sectio'nalpl view representing a portion of the thread-laying mechanism. Fig. 5 is a perspective view illustrating the method of cooperation of the thread-laying devices with the needles; Fig. 6 is a perspective;view showing the under side of the throat-plate.

As represented in the drawings, the ma.- chine is constructed substantially in accordance with the patent of William H. Hugg, No. 1,005,645, datedOctoberzlO, 1911. It is Constructed with the usual'base 1 and head 4 f which is journaled the vertically.

bracket-arm comprising the hollow standard 2, and tubular overhanging member 3 in the invention is -'sus'ceptibleof embodiment ir \ditferent iways, in itspreferred form it is applied to a multiple ,ne-ed-le' chain-stitch-maohine comprising a plurality: ofj-thread-c'arrying needles actu- The covering-thread mech- Si ti 1 m f Ya'tnt 2 Patented Apr-.29, 1913. Application ames te nber' 13,1911? "Serial No. Mill 1 46; l l v clamp 6, carrying the threefeye-pointe'd 4 needles 7.

The longitudinally arranged main or driv- I y 0 a ing shaft 8'--1s Ournaled in suitable bearings.

in the base .-1 beneath 'the work-plate 10 and is provided near its rearward'end with an actuating crank 9 and in practice receives its motion from the-usual pulley mounted uponits rearward end.- 1 The needle-actuating rock-shaft 11 is journal'ed in, suitable bearings within and longitudinally of the overhanging bracket-arm and carries. at 'itS forward end a collar 12 formed with the crank-arm'13 provided with the crank-pin13. connected by means of the usual link 14 with a rearwardly projecting stud carlried'by the collar 15 fixed-upon the needle-bar 5, through which connections the needles receive their operative movements from the rock-shaft 11-. The needle-actu-- "ating rook-shaft has fixed upon its rearward end a collar with oppositely extending crank-arms 16 and 17, the former of which is connected by means of the pitman-rod 18 with the'crank -9 of the driving shaft 'from'which the needle-actuating rock-shaft derivesits rocking movements. The second crank-arm 17 isconnected by means of the pitman19 with the rearward'ly extending arm 20 of an. elbow-lever mounted upon the transversefulcrum-pin '21 and having an 'upwardly, eXtending-j arm 22 connected by means of the'pitman 23 'with the rocking looper-carrier 24:, upon which are secured the lower-thread carrying looper 25 and adjacent needle-guard 26. f v

Fixed upon the' -mainshaft is the feedactuatingeccentric 27 embraced by the strap 28 of an-eccentric-rod connected with the feed-rocker 29 which is journaled upon the fulcrum-pin 30 and has pivotallyconnectd thereto the rearward end of the feed-bar 31 carrying the feed-dog32. The main-shaft loo vhas fixed thereonfthe feed-lifting eccentric 33 upon which isfitted the slide-block 34 embraced by the depending yoke 35' of the feed-bar 31 by means of which rising and falling movements are imparted to-the feeddog 32.

'Journaled in the bracket-arm head 4 is the presser-bar 36 normally pressed downwardly by means of the pressure spring 37 -andhaving-secured to its reduced lower end by' means of the fastening screw 38 the shank portion 39 of the presser-foot to whose reduced lower extremity is pivotal'ly attached by means of the transverse pm 40 posed the spaced backwardly projecting thread-fingers 43. Asrepresented in Fig. 6,

.the throat-plate 44 is formed with the spaced feed apertures 45 corresponding in number and arrangement with the operative portions of the feed-dog, and having the needle aperture46 divided in its forward portion into separate needle-slots by means of the backwardly extending tongues 47 which cor-- respond in position with those of the presser-foot.

The machine, as thus far described, is adapted for producing a multiple chainstitch seam with spaced parallel lines of stitching upon the upper face of the work but connected on the lower face by transverse loops of looper-thread.-

The presser-bar 36 has, secured thereon slightly above the presser-foot shank 39 by means of the set-screw 48 the collar 49 formed with laterally extending ears 50 each carrying a fulcrum stud-screw 51. Upon each of the fulcrum-studs 51 is mounted an angular rock-lever comprising a lateral arm 52 having a spherical extremity 53 and a second forwardly extending arm 54 having a vertical socket 55 and a transverse set screw 56 whose point is adapted to enter the same. As seen in Figs. 1, 3 and 4, the righthand lever-arm 54 is provided adjacent its socket with an ear 5'? having a thread-eye 58, and the adjacent socket has secured therein by means of the set-screw 56 the shank 59 of the depending covering-thread arm 60 which is formed with the tubular threadguiding lower extremity 61. The other lever-arm 54 has secured in its socket the shank 62 of the depending non-threaded covering-thread arm 63 terminating at its lower end in the fork 64.

The spherical extremity 53 of the lateral arm 52 of each anglelever is embraced bya strap 65 at one end of a pitman 66 having a similar strap 67 at its opposite endembracing the ball-stud 68 extending laterally from 2 the depending arm 69 of a rocker fulcrumed upon the pin 70 between rearwarelly extending bearing lugs 71 of the bracket-arm head 4 and having a rearwardly extending arm 7 2. The rocker-arm 7 2 is connected by means of the pivotal pin 73 with the lower end of a bent link 74 whose apertured upper end embraces a crank-pin in the form of a stud-screw 7 5 tapped into the outer face of the collar 12 upon the needle-actuating rockshaft 11. The studpin T5 is so positioned 65 relatively to the crank-pin 13 and the pivotal connection 73 of the'link 74 with the rocker-arm 7 2 that it moves into substantial alinement with the rock-shaft 1]. and pivotal pin 72' while the needles are in their upper positions, and thus retracted from the work,

thereby giving to the thread-arms SOand 63 a dwell sufliciently long, in such stageof the stitch-forming cycle, to enable the pointsof the needles to enter the work before the thread-arms perform any substantial portion of their succeeding operative movements. p In the use of the machine, the looper is threaded in the usual manner and the needle-threads a, b and c are led through their respective tensions 76, and thence through their thread-eyes in the fixed thread-guide 77 from which they are led.

through guide-eyes of the thread-controller arm 8 and through apertures of the takeup arm 79 carried by the link 14 from which they pass through the apertures of the rigid arm 80 secured upon the upper end of the needle-bar and thence downwardly to the eyes of their respective needles. The covering thread (i is led from the source of supply through the tension 81 and through its respective aperture of the thread-guide 77 and thence passes through the fixed thread guide 82 upon the bracketarm head 4 and the aperture 58 of the guide-lug ,59 on the vibratory lever-arm 54 from which it'is led through the delivery aperture 61 of the thread-carrying arm 60 to the work. The material m having been introduced between the presserfoot and the throat-plate, the machine is set in operation. As the needles descend the threadarms 60 and 63 remain in their extreme thread-presenting positions represented in Figs. 1 and 5. the end of the coveringthread-being threaded through the needle aperture 42 of the presser-foot and being held beneath the latter. As the points of the needles pass below the delivery aperture of the thread-arm 60, the thread-arms perform their retractive movements to the dotted line positions represented in Fig. 5, which they attain as the needles reach their extreme lower positions. In beginning their ascent, the needles present their loops which are entered by the looper and simultaneously with the rise of the needles the thread-anus (SO and 63 accomplish their return to operative position, during which the fork 64-0f the thread-arm 63, which passes between the delivery eye 61 of the thread-carrying arm 60 and the needles, seizes and spreads the covering-thread d for passage of the needles in their succeeding descent. The thread-arm 60 is so sus-' tained and operated that when in threadlaying position its delivery orifice is disposed slightly rearward of the adjacent needle, while the fork of the non-threaded thread loop rearward of and the other limb arm 62 in its correspondinglstage of movement presents one limb of the covering;

in front of the path o-f-reciproca'tion of the adjacent needle. When three needles are .used, thefintermediate"needle is prefer---' ably disposedQ-slig'htly out of. alinement with the .ot-her two, sothat in'the succeeding descent of the needles .the middle and right hand needles descend betwee the dis-. tended limbs of the covering-thr ad loop, and the, left-hand needle desce'nds] in front of the forward limb of suchloop leading. from the thread-arm'GOi As the stitching;

continues, the thread-arms continue to perform their reciprocations transversely of the direction of feed and in front of the needles, each receiving" ato-and-fro' movement for every rec procation of the needles,

so that loops of covering-thread are laid intermediate the needle-apertures crosswise of the direction of feed similarly with that of the looper-thread upon the lower faceof the fabric, the looper receiving the usual endwise and sideW-ise movements in interl'oopingits thread with the-needle-threads.

WVhen the covering seam is appliedto very.

thin or elastic material such as knit goods,

to insure the proper laying of the threads, and prevent puckering, the presser-footandthroat-plate are provided with the I supporting tongues 43 and 47 each extending. from the forward end of the needle aperture in the direction of feed and having its farther. face inclined toward the material,

whereby the looperandupper covering-- threads are supported'by such tongues dur.-.

ing the 'formation and setting of the stitches, to be thereafter drawn from the same in the succeeding feeding'action. 'In a the finished seam, as represented in Fig. 5,

I loops of covering-thread d are laid' alternately at opposite sides of the stitch line.

and each is entered by a thread-loop-of the adjacent needle through both -of' which needle-thread loops is passed a loop. of looper-'.

- thread e which embraces the succeeding extending from the loop of-the needle adjacent the member 61 of the thread-arm 60. By the'slight-stag gering of the needles as before described,

thread loops passing. through the correspending needle-thread loops is distended for passage of the. succeeding needle-thread loops. In case a covering seam having only the outer lines of stitching is required, the

. middle needle may be omitted, in which case the coveringmthread loops upon the bers are therefore secured without resort to .little noise; and ,wear of'the'parts, therebyinsuring; a materially increased rate' ofpro- 'ductio-n over-machines of the' 's'amefclass.

upper face of'the fabric will he laid metrically, and the loops of looper-thread will be correspondingly dis-posedgupon the lower face of'the' fabric. Itis thus evident thatthe employment of the, intermediate present improvement, and that it has no important'function .in the laying and secur ing-imposition of the covering-thread. Q

' It is evidently, not essential that the c ov ering-' thread laying members 61 and 64;- should havereciprocal movements transverse to the direction of feed, asthey would coep'erate efiecti-velyif given movements in angularly' disposed paths, such as those of the corresponding members .of. the mechanism forming the subject of-the pending'application of .Martin Hemleb, Ser. No. 582,162, filed;Sept. .I5,-1910. I 1

. From-theforegoingdescription, it will be seen that the coveringthread laying members of the present improvement derive their respective operative movements from an operative connection including a toggle device formed by the collar .12 and link 74 needle is entirely optionallin the use of the,

through the crank-pin 75 with, the'needleactuating-"rockshaft, and that the .acceler-l ated reciprocatory movements of these'inem-i the usual actuating cam. By th'is' 'means, and by'reason of its simplicity ofconstruction, the mechanism is capable -of-being-op-, erated at a high rate of speed and with heretofore constructed; =1 r 'Having' thus set-forth thelnature of the in vention', what Iclaimherein'ise 1L The combination with stitch-forming rocating needles and c'o'ciperatin'g. loop-tak-' in'g means, and feeding mechanism,'of nee dle-actua-ting means including a; rock-shaft,

a covering-thread laying member movable transversely. of the direction. of 'feed, a cooperating covering-thread laying -member,i

and .means including a crank-and'pitman connection vwith said rock-shaft .for impart-' ing operative movements to said thread-laying members. i i

I 2. The combination with stitch-forming mechanism comprising a pluralityv ofreciprocating needles and cooperating loop-taking means, and feeding mechanism, of needle-actuating means including a rock-shaft,

'a plurali 'y of covering-thread laying members movable transversely of thedirectioir of feed, and means including a crank-andpitman connection with said rock-shaft for impartingreciprocal operative movements. to said thread-laying members.

- 3. The combination with stitch-forming mechanism comprising a plurality of reciprocating needles and cooperating loop-tak- '05 mechanism comprising a plurality of rec1p-f ing means, and feeding mechanism, of needle-actuatingimeans including a rock-shaft,

a covering-t read laying member movable transversely of the direction of feed, a cooperating covering-thread, laying member, and an operative connection between the thread-laying members and said rock-shaft .and including a toggle device adapted to be ,dle-actuating means including a rock-shaft,

a covering-thread laying member movable transversely of the direction of feed, a cooperating covering-thread laying member, a plural-armed rocker, a crank-and-pitman 1 connection between-one arm of the same'and the needle-actuating rock-shaft, and an operativeconnection'between another arm of said rocker and the first-named thread-laying member.

. 5. The combination with stitch-forming mechanism comprising a plurality of reciprocating needles and cooperating loop-taking means, and feeding mechanism, of me 30 Za' covering-thread laying member movable transversely of the direction of feed, a co-,

dle-actuating means including a rock-shaft,

operatin reciprocatory covering-thread laying mem er,'a plural-armed rocker, an operative connection comprising a toggle device between one arm of said rocker and the needle-actuating rock-shaft, and independent operative connections between another arm of said rocker and said thread-laying members. a,

6. The combination with stitch-forming mechanism comprising a needle-bar carrying. a plurality of reciprocating needles, a loop-taker cooperating-with said needles, and feeding mechanism, of a needle-actuating rock shaft provided with a crank-arm, a pitman connection between said crank-arm and the needlebar, a" plural-armed rocker mounted upon a fixed fulcrum, apivotal pin carried by an arm of said rocker, a crankpin carried by the needle-actuating rockshaft and movable into and out of alinement with the latter and said pivotal pin of the rocker arm, a link connection between said' crank-pin andsaid pivotal pm, two 1nde-' pendently movable rock-levers, cooperating covering-thread laying arms each carried by one of said rock-levers and reciprocally movable therewith transversely to the direction of feed and in front of the needles, and independent operative connections between said rock-levers and said rocker.

In testimony whereof, I have; signed my name to this specification, in the presence of two subscribing witnesses.

JOSEPH BERGER. 

